event based update of server availability

package-lock.json

package.json

src/components/experiment-list/experiment-list-element.js

src/components/experiment-list/experiment-list.js

...ces/experiments/execution/experiment-execution-service.js

...rvices/experiments/execution/experiment-server-service.js

...ervices/experiments/storage/experiment-storage-service.js

src/services/http-service.js